Smartphones are everywhere, and they may be smarter than you think. Our cell phones actually reflect the personal microbial world of their owners, with potential implications for their use as bacterial and environmental sensors, according to new research. New research focused on the personal microbiome - the collection of microorganisms on items regularly worn or carried by a person - demonstrates the significant microbiological connection we share with our phones.

To test our biological connection with phones, University of Oregon researchers sequenced microbes from the dominant-hand index fingers and thumbs of 17 subjects and from the touchscreens of their smartphones, during a recent Robert Wood Johnson Foundation workshop in Princeton, New Jersey. The study found smartphones closely resembled the microbiome sampled from their owner's finger, with 82 percent of the most common bacteria on participants' fingers also found on their phones.

Interestingly, women were found to be more closely connected, microbiologically speaking, to their phones than were men. Although men and women were both statistically similar to their own phones, the relationship was stronger for women than for men. The findings appear in the online open-access, peer-reviewed journal PeerJ.

The most commonly found bacteria were from three genera that are ubiquitous on and in humans: Streptococcus, which is commonly found in the mouth, and Staphylococcus and Corynebacterium, both common skin residents.

The analyses, utilizing short-read 16S sequencing, focused on categorizing whole microbial communities rather than identifying pathogens. The findings emerged from sequences representing more than 7,000 different types of bacteria found in the 51 samples taken from fingers and phones.

"The sample size was small, but the findings, while intuitive, were revealing," said lead author James F. Meadow, a postdoctoral researcher in the Biology and the Built Environment Center at the University of Oregon.

"This project was a proof-of-concept to see if our favorite and most closely held possessions microbially resemble us. We are ultimately interested in the possibility of using personal effects as a non-invasive way to monitor our health and our contact with the surrounding environment," he said.

Future uses could include real-time sequencing technology to screen the smartphones of health-care workers and hospital visitors, rather than the people themselves, for possible exposure to pathogens that could be carried into or out of a medical facility. Also, phones are ubiquitous and come into direct contact with so much of a person's environment that they might also be valuable for analyzing exposure to "biological threats or unusual sources of environmental microbes that don't necessarily end up integrated into our human microbiome," researchers noted.

The findings also present opportunities for future scientific use, as phones could be used for easy and non-invasive sampling in large-scale microbial studies. The next step is to expand this research to develop and test predictions about the spread of microbiota among people and over time, particularly in health care facilities where hospital acquired infections impact about 1 in every 20 patients.

Abstract (from the article):
Most people on the planet own mobile phones, and these devices are increasingly being utilized to gather data relevant to our personal health, behavior, and environment. During an educational workshop, we investigated the utility of mobile phones to gather data about the personal microbiome — the collection of microorganisms associated with the personal effects of an individual. We characterized microbial communities on smartphone touchscreens to determine whether there was significant overlap with the skin microbiome sampled directly from their owners. We found that about 22% of the bacterial taxa on participants' fingers were also present on their own phones, as compared to 17% they shared on average with other people's phones. When considered as a group, bacterial communities on men's phones were significantly different from those on their fingers, while women's were not. Yet when considered on an individual level, men and women both shared significantly more of their bacterial communities with their own phones than with anyone else's. In fact, 82% of the OTUs were shared between a person's index and phone when considering the dominant taxa (OTUs with more than than 0.1% of the sequences in an individual's dataset). Our results suggest that mobile phones hold untapped potential as personal microbiome sensors.

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